Issuing the copy running-config startup-config command may produce a prompt to erase Flash, as shown in this command output:
Router#copy run start Destination filename [start]? Erase flash: before copying? [confirm] Erasing the flash filesystem will remove all files! Continue? [confirm] Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ee ...erasedee Erase of flash: complete Verifying checksum... OK (0xA83F) 7056 bytes copied in 0.836 secs
To erase any files on the Flash device, including the Cisco IOS Software file, select Enter at the Erase flash: before copying? [confirm] prompt. The router then reloads and goes into ROM Monitor (ROMmon) mode.
To resolve this issue, enter n so that the Cisco IOS Software file in Flash is not erased. The running configuration file is copied into Flash, but the Cisco IOS Software file also remains on Flash, leaving the router bootable.
As a workaround, issue the write memory command. This saves the running configuration to NVRAM, as this command never prompts to erase Flash.
If Flash has already been erased, do not reload the router because it will go into ROMmon mode, since no Cisco IOS Software image is present on Flash.
Copy the Cisco IOS Software file back into Flash before reloading the router.
For instructions on this procedure, refer to Loading Software using TFTP or RCP.
When Problem Occurs
After software configuration change